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Fair Value of Financial Instruments - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Residential mortgage loans held in securitization trusts – impaired loans, net |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loans held in securitization trusts – impaired loans, net | $ 8,959 | $ 10,317
Real estate owned held in residential securitization trusts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate owned held in residential securitization trusts | 111 | 111
Level 1 | Residential mortgage loans held in securitization trusts – impaired loans, net |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loans held in securitization trusts – impaired loans, net | 0 | 0
Level 1 | Real estate owned held in residential securitization trusts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate owned held in residential securitization trusts | 0 | 0
Level 2 | Residential mortgage loans held in securitization trusts – impaired loans, net |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loans held in securitization trusts – impaired loans, net | 0 | 0
Level 2 | Real estate owned held in residential securitization trusts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate owned held in residential securitization trusts | 0 | 0
Level 3 | Residential mortgage loans held in securitization trusts – impaired loans, net |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loans held in securitization trusts – impaired loans, net | 8,959 | 10,317
Level 3 | Real estate owned held in residential securitization trusts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate owned held in residential securitization trusts | $ 111 | $ 111

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Total of (1) improvements, (2) held-for-sale, (3) land and land under development, (4) construction-in-process, (5) mortgage loans held-in-inventory, and (6) other real estate investments which are considered inventory due to being held for sale or disposition. + References No definition available. + Details
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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as held-to-maturity. + References No definition available. + Details
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